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Rongsheng Silicon Carbide Mullite Bricks
Dec 10 2018
Silicon Carbide Mullite Bricks

Silicon Carbide Mullite Bricks Description

Silicon carbide mullite bricks are also called high alumina silicon carbide bricks. SiC mullite brick main mineral phase is SiC and mullite. It can be produced by SiC and bauxite clinker. During high temperature application in kilns, silicon carbide can be oxidized and produce SiO2, which can react will Al2O3 to form mullite (3Al2O3·2SiO2).The synthesized mullite can not only enhance brick’s density and strength, but also form protection film  to prevent further oxidization of SiC. The un-reacted SiC can enhance thermal shock resistance, abrasion resistance and corrosion resistance of silicon carbide mullite bricks.      

silicon carbide mullite brick

Silicon Carbide Mullite Bricks Characteristics

  1. Abrasion Resistance

SiC mullite brick’s principle phases are high rigidity SiC, mullite and corundum, meanwhile, SiC mullite bricks has high structural density, its bulk density is between 2.7 and 3.0g/cm3. So SiC mullite bricks have good abrasion resistance. Silicon carbide mullite brick’s density, strength and abrasion resistance is significantly better than high alumina bricks and magnesia alumina spinel bricks.

  1. Spalling Resistance And Thermal Shock Resistance

SiC in silicon carbide mullite bricks has high thermal conductivity, small thermal expansion rate, so SiC carbide mullite bricks have good thermal stability, max. thermal shock times can reach to 46 times(1100℃, water cooling).

  1. Insulating Performance

Silicon carbide mullite brick’s thermal conductivity(≤2.3W·(m·K) is lower than spinel bricks, and thus have better heat preservation effect.

  1. High Temperature Performance

SiC mullite brick’s refractoriness under load is above 1500℃, max. is 1690℃, can endure high temperature impact and won’t soften or deform.

silicon carbide mullite bricks

SiC Mullite Bricks Physiochemical Index

Item GM1650 GM1600 GM1550 GM1680
Al2O3 % 63 60 57 63
SiO2+SiC % 30 30 30 30
Apparent porosity % 17 17 19 17
Cold crushing strength Mpa 85 90 90 100
Refractoriness under load ℃ (0.2Mpa) 1650 1600 1550 1680
Thermal shock resistance(11oo℃, water cooling) 10 10 12 13
Bulk density g/cm3 2.65 2.60 2.55 2.65
Cold abrasion resistance cm3 5 5 5 5
Thermal conductivity(w/m·k) 1.7 1.7 1.7 1.7

SiC mullite brick

 Silicon Carbide Mullite Bricks Application

Due to silicon carbide mullite brick’s good abrasion resistance, high refractoriness and thermal shock resistance, it is popularly used in rotary cement kiln sintering zone, transition zone and so on,  where material rolling friction, high temperature thermal stress, temperature fluctuation and material corrosion are severe.

silicon carbide mullite brick

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    iron trough castable
    Dec 7 2018
    Iron Trough Castable

    Iron Trough Castable Description

    Different iron smelting factories have different design of blast furnace iron troughs, such as iron storing trough and non storing iron trough, single iron trough and multi iron troughs. Blast furnace iron troughs can also be divided into main trough, branch channel, swing channel and slag channel. Different types of refractory materials can be used as per the types of iron troughs. Iron storing troughs in middle and large scale steel mills usually adopt Al-Si-C series castable.

    iron trough castable

    Iron Trough Castable Characteristics

    Blast furnace iron trough should endure iron liquid and molten slag intense scouring, high temperature iron liquid and molten slag chemical corrosion & permeation. So iron trough and slag trough castable should have enough mechanical strength and corrosion resistance. Once there is damage in the trough, it should be patched as soon as possible, which requires iron trough castable has good flowability, few water addition quantity and can be quickly dried. Besides, iron trough lining’s temperature fluctuates greatly, so iron trough castable should also has excellent thermal shock resistance.

    alumina silicon carbide carbon castable

    Iron Trough Castable Physiochemical Index

    Item DCTC-1 DCTC-2 DCTC-3 DCTC-4
    Material Alumina silicon carbide carbon castable Alumina silicon carbide carbon castable Alumina silicon carbide carbon castable High alumina silicon carbide castable
    Application Main trough slag line Main trough iron line Main trough iron line Main trough slag line
    Al2O3 % 60 83 77 56.9
    SiC % 37 12 11 32
    SiO2 % 2.5 2.5 / /
    C % 1~3 1~3 2 2
    Bulk density g/cm3(1450℃,3h) 2.78 2.98 2.84 2.69
    Compression strength Mpa(1450℃,3h) 50 50 35.8 /
    Reheating linear change rate %(1450℃,2h) -0.2~0.6 -0.2~0.6 -0.2~0.6 -0.1~0.2
    Item DCTC-5 DCTC-6 DCTC-7 DCTC-8
    Material Alumina silicon carbide carbon castable Alumina silicon carbide carbon castable High alumina silicon carbide castable High alumina silicon carbide castable
    Application Main trough cover top Main trough cover sides Iron trough Slag trough
    Al2O3 % 65.3 67.1 49.1 60.4
    SiC % 15 15 9.33 14
    SiO2 % / / / /
    C % / / / 1~3
    Bulk density g/cm3(1450℃,3h) 2.78 2.98 2.84 2.69
    Compression strength Mpa(1400℃,3h) 2.52 2.56 2.38 2.68
    Reheating linear change rate %(1400℃,3h) 0.22 ±0.35 -0.12 ±0.5

    So alumina silicon carbide carbon castable is mainly used for the casting of blast furnace iron trough. Alumina silicon carbide carbon castable’s main materials are fused corundum(or sintered corundum, special grade bauxite clinker), graphite contains 90%~95% fixed carbon, silicon carbide and so on. During construction, additives should be added and fully mixed before casting. For slag trough, lower grade of alumina silicon carbide carbon castable can be used, It can not only meet production requirement but also has better economic benefits. High alumina silicon carbide castable, which has excellent abrasion resistance is the best choice for slag line.

    In recent years, quick dry Al-SiC-C castable is developed for casting houses which only have one iron running trough. The development of self flow Al-Si-C castable brings lots of convenience for casting construction. The unit refractory consumption of per ton iron is significantly decreased with the improvement of castable quality.

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      Non-stick aluminum castable
      Dec 6 2018
      Non-Stick Aluminum Castable

      Non-Stick Aluminum Castable Description

      Non-stick aluminum castable is mainly used in aluminum smelting furnace, aluminum press casting heat preserving furnace and so on. Although the melting point of aluminum is not high, only about 660℃, aluminum liquid has low viscosity, high permeation ability and high activation property, which makes it have drastic corrosion to refractory furnace lining.

      aluminum castable

      The Damage Mechanism Of Refractory Lining

      1. Aluminum liquid can react with SiO2 in Al2O3-SiO2 series refractory material and produce Al2O3+Si. So the structure of Al2O3-SiO2 refractory will be destroyed, meanwhile, impurity Si will also contaminate aluminum liquid.
      2. Aluminum liquid can infiltrate into refractory material pores, increases the contacting area of refractory material and change the composition. When the infiltration reaches to a certain depth, accompanied with the reaction of aluminum and SiO2, refractory material will have structural spalling.

      Non Stick Aluminum Castable Property

      To solve this problem, refractory material contacting with aluminum liquid should adopt non-stick aluminum castable. Non-stick aluminum castable has high density(low porosity), good high temperature, middle temperature and room temperature strength, and the strength is positively correlated to temperature. Meanwhile, non-stick aluminum furnace castable has good volume stability at different temperature. With the addition of ultra micro powder component, the porosity of non-stick aluminum processing castable is lower than 10%, the average pore aperture is only 0.5μm. So aluminum liquid can’t permeate into non-stick aluminum castable lining. What’s more, composite additives added in castable can increase aluminum liquid’s contact angle with castable lining and significantly strengthen lining’s aluminum liquid permeation resistance.

      aluminum processing castable

      Non-Stick Aluminum Castable Physiochemical Index

      Item BZL-1 BZL -1A BZL-M BZL-F BZL-G
      Chemical composition Al2O3≥ 60 65 65 70 80
      Fe2O3≤ 0.6 0.5 0.4 0.4 0.3
      BaO+ZnO+B2O3≥ 3 3 3 4 4
      Bulk density g/cm3≥ 2.4 2.5 2.65 2.7 2.8
      Compression strength

      Mpa≥

      		 110℃*24h 35 40 40 45 45
        1300℃*16h 40 45 45 50 50
      Rupture strength

      Mpa≥

      		 110℃*24h 5 10 10 12 14
        1300℃*16h 10 13 13 15 16
      Linear change rate % (1300℃*3h) 0～+0.2 0～+0.2 0～+0.2 0～+0.1 0～+0.1

      Non-stick aluminum castable

      Non-Stick Aluminum Castable Application

      Non-stick aluminum castable is specially developed for aluminum processing industry, it is mainly used in aluminum melting furnace wall, furnace bottom, degassing tank, launder and fore-tank. No stick aluminum castable is also used for the furnace lining of keeping furnace, aluminum liquid heat preserving furnace, aluminum ladle and so on. Especially suitable for the integral casting of heat preserving furnace and lining of high purity aluminum smelting equipment. Non-stick aluminum castable synthesizes the characteristics of organic binders and inorganic binders, added in certain quantity of new type composite material, can effectively avoid the infiltration of aluminum liquid and significantly prolong the service life of refractory castable lining.

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        SiC castable
        Dec 6 2018
        Coating Resistant Silicon Carbide Castable

        Coating Resistant Silicon Carbide Castable Description

        Silicon carbide castable is also call coating resistant silicon carbide castable. It takes SiC as main raw material, pure calcium aluminate cement as binder, added with high efficient water reducing agent and ultra micro powder. Silicon carbide is high grade synthesized refractory material, has a wide range of application in refractory industry. Due to its particular characteristic, SiC has very low adhesion ability with cement raw material.

        SiC castable

         Coating resistant castable’s aggregate mainly compromise low bauxite aggregate, scrap ceramics, scrap electroceramics, SiC and so on. Aluminate cement is usually used as binders of SiC coating resistant castable. Usually, cement raw material is hard to adhere to the surface of SiC castable, so the chance of cement raw material agglomeration at kiln tail is greatly decreased. The application of silicon carbide castable in cement kiln, can avoid the coating of cement in kiln, so the output of cement production line will raise correspondingly.

        coating resistant castable

        Coating Resistant Silicon Carbide Castable properties

        Coating resistant SiC castable has good abrasion resistance and corrosion resistance.

        Good high temperature mechanical strength, high thermal conduction coefficient.

        Small linear expansion coefficient, excellent thermal shock resistance.

        Won’t react with cement raw material.

        Silicon carbide castable has good coating resistance, can significantly decrease coating times.  

        Coating Resistant Silicon Carbide Castable physiochemical index

        Item SiC-30 SiC-50
        Al2O3 % ≤ 35 25
        SiC ≥ 30 50
        Bulk density g/cm3(110℃,24h) 2.40 2.50
        Cold compression strength Mpa (110℃,24h) ≥ 80 70
        Cold rupture strength Mpa (110℃,24h) ≥ 9 8
        Permanent linear change rate % (1100℃,3h) ±0.4 ±0.4
        Alkali resistance grade I I
        Max. working temperature ℃ 1350 1400
        Water addition % 6.0~7.0 5.5~6.5

          Coating resistant SiC castable

        Coating Resistant Silicon Carbide Castable Applications

        Based on SiC content, coating resistant SiC castable can be classified into two types: one is SiC-30, which’s SiC content is no less than 30%, the other is SiC-50, which’s SiC content is no less than 50%. Both SiC-30 and SiC-50 SiC castable can be used in places of new type middle large scale dry cement kiln pre-heater feeding slope, ascending flue, decomposing furnace cone and so on, where cement coating is easy to form.

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          tabular corundum castable
          Dec 5 2018
          Tabular corundum castable

          Tabular Corundum Castable

          Tabular corundum castable is high grade monolithic refractory which is composed of tabular corundum aggregate, fines and high alumina binder. Based on different applications, different kinds of ingredients can be added into tabular corundum castable to enhance its thermal, chemical and mechanical performances. For example, chrome corundum castable which has high refractoriness can be applied in carbon black furnace, coal gasifier lining. zirconia corundum castable which has excellent glass corrosion resistance is suitable for glass kiln. Composite corundum castable with specific composition can be used for various industrial kilns and furnaces such as cement rotary kiln, nonferrous metal smelting furnace, steel industry and so on.

          tabular corundum castable

          Tabular Corundum Castable Property

          High mechanical strength, good abrasion resistance.

          Excellent thermal shock resistance, creep resistance.

          High refractoriness, good high temperature volume stability.

          Excellent Slag corrosion resistance, chemical corrosion resistance.

          Convenient for construction, maintenance and patching.

          corundum castable

          Tabular Corundum Castable Physiochemical Index

          Item Tabular corundum castable High alumina castable
          Model GYJ-90 GLJ-80
          Refractoriness / ℃ 1810 1790
          Bulk Density / g/cm3 ≥ 2.85 2.85
          Al2O3  % ≥ 90 80
          Thermal shock resistance (1100℃) /times ≥  80 70
          Alkali resistance > 2 1
          110℃ Wear resistance ，≤ 6 6
          Rupture Strength，(110℃, 3h) Mpa ≥ 13 10
          Compressive Strength (110℃, 3h) Mpa ≥ 110 100

          Corundum Castable Application

          Corundum castable has a wide range of application in various kinds of industrial kilns and furnaces, one main application of tabular corundum castable is iron and steel industry. For example, for the casting of steel ladle working lining, sliding gate valve and tapping nozzle, long nozzle, submerged nozzle, tornado tank working lining, purging plug, pocket brick, iron runner and the integral casting of electric arc furnace cover triangle zone. Other applications of tabular corundum castable are rotary kiln front mouth, coal injection tube, circulating fluidized bed boiler, RH furnace immersion tube outer lining, petrochemical industry high temperature catalytic cracking reactor working lining, etc.

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